Holley's science vs Edelbrock simplicity?

The problem with the Carter is simple. Float bowls way too small. Not enough needle and seat area. The float bowls sit over the hottest part of the intake.

Ability to tune individual circuits on the Carter is much more difficult. Not that it can't be done. It's just much more time consuming.

The Holley is relatively simple. The real problem is that for more decades than I care to admit, the idiots at Holley and the neophytes who write trash articles teach people incorrect tuning for the Holley. The biggest mistake guys make is not getting the power valve timed correctly. That's HUGE for a street driven car. And Holley is evidently too stupid to teach its users how the main jet and the power valve work together and how to tune for cruise and WOT using both. That has done more damage to Holley tune ups than anything else.

The science of both carbs is the same. A correctly tuned Holley will out power, out drive and out MPG a Carter all day long.

In fact, it's a well known fact that both carbs are 100 MPG carbs.